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(NMoaeL) J.l P. SNEDIKER.

BUTTON EoLE SEWING MACHINE. No. 261,399.

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(No Model.)

J. F. SNEDIKER. A BUTTON HOLE :s1-:WING MACHINE.

- Patented Jul 18, 1882.

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c UNITED STATES PATENT OFFICE.

JAMEs E. sNEDIkEE, o F PEIL'ADELPHIA, PENNSYLVANIA, AssIeNoE 'ro THE NATIONAL sEwINGr MACHINE COMPANY, (LIMITED) oF SAME PLAGE.

BUTTON-HOLE SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 261,399, dated July 18, 1882.

Application niet Aprn24,1ss2. (No model.)

To all whom it may concern:

Be it known that I, JAMES F. SNEDIKER, a citizen of the United States,residing in Philadelphia, Pennsylvania, have invented certa-in Improvements in 'Button Hole Sewing-Machines, of which the following is a specification.

' My invention relates to an improvement in the button-hole sewing-machine for which Letters Patent No. 51,086 were granted to the assiguees of George Behfuss, November 21,1865, antedated June 17 1865; and the object of my invention is to aord facilities for the applica-' tion of automatic attachments to the machine.

In the accompanying drawings, Figure 1, Sheet 1, is a side view, partly in section, of a button-hole sewing-machine showing my improvement 5 Fig. 2, Sheet 2, a plan view ofthe mechanism to which myinvention relates; Fig. 3, a perspective view of part of Fig. 1, and Fig. 4 a modication of my invention.

A is the bed-plate, B the stationary arm, D the vibrating needle-arm, and E the driving-shaft, of a button-hole sewing-machine of the class referred to above.

' To the under side of the bed-plate is pivoted a looper-arm, F, carrying at its outer end the eye-pointed looper afor the under thread, this arm forming, with a shorter arm, G, a bell-crank lever, and this short arm being provided with an antiAfriction roller, b, adapted to thelgroove of the scroll-cam H on the driving-shaft. The pivot-pin of the looper-arm is so inclined that the said arm and looper c, when depressed, will occupy the position shown in Fig. 2, and when the arm is raised the looper a will be near the usual eye-pointed needle, lz, which is attached to the needle-bar I. Asleeve, J, concentric with the needle-bar, is oscillated on the same, and to this sleeve is attached the loopcatcher m. By the combined action of the loopcarrier a, eye-pointed needle h, and loop-catcher m a button-hole stitch is formed on the edge of the fabric.

The above description applies to the wellknown button-hole sewing-machine manufactured under the aforesaid patent.

Heretofore the fabric has been guided'by hand in using this machine-a duty requiring skill and experience on the part of the operator.

In attempting to apply automatic devices for traversing the fabric to machines of this class the fact that when the looper is depressed the needle is in the fabric and when the needle is out of the fabric thelooper projected above the same presented V'difliculties in the way of adjusting the clamping-plate carrying the fabric and connected with the automatic mechanism to the bed-plate of the machine. In order to overcome this difficulty, I make the scrollcam H adjustable on the driving-shaft E, instead of securing it permanently thereto. On sliding the scroll-cam in the direction of the arrow, Fig. 1, the arln F will be depressed and the loop-carrier a will be beneath the bedplate, where it may be permitted to remain until the automatic device carrying the fabric is adjusted to the baseplate beneath the needle.

There may be a groove in the shaft and a feather in the eye of the scroll-cam.

Different devices may be used for moving back the cam; but I prefer a bar, M, so secured to the under side of the bed-plate that it can be moved to and fro longitudinally thereon to a limited extent, the bar being provided with a pin, d, entering the groove e ofthe cam, and the pin having, if deemed necessary, a roller adapted to the groove. Another plan is to provide the bar with two horizontal anti-friction rollers, w between which the scroll-cam is confined, as shown in Fig. 4.

The device for operating the bar M consists, in the present instance, of a disk or plate, N, adapted to turn on a pin, n, screwed into or otherwise secured to the base-plate, the disk having a cam-slot, through which extends a pin, fw, on the bar, and the bed-plate of the machine being slotted to receive and permit the longitudinal movement of the pin.

By turning the disk in one direction the bar and the scroll-cam M will be moved rearward, and the looper-arm and looper will consequently be depressed, and by moving the disk in the other direction the looper-arm and looper will be restored to their proper working condition.

Further facilities for'the application of automatic devices to the bedplate of the machine maybe aiforded by making the scroll-cam W, which operates the needle-arm, adjustable on the driving-shaft, the cam being combined with a bar, Y, Fig. 2, movable on the bed-plate of the machine, and provided with anti-friotion rollers t. On sliding the cam in the direction of its arrow, Fig. 1, the needle will be raised and more room will be afforded for the application of the clamping-plate and automatic mechanism to the bed-plate of the machine.

Mechanism similar to that described above for operating the bar M may be used for operatin g the bar Y.

I claim as my invention- Y l. The combination of the driving-shaft E, loopcr-arm F, and looper a of a button-hole sewing-machine with the scroll-cam H, movable longitudinally on the said shaft, substantially as set forth.

2. The combination of the adjustable barM on the bed-plate, the looper-arm, and shaft E JAS. F. SNEDIKER.

Witnesses HARRY DRURY, HARRY SMITH. 

